Brandon Moss (left), Josh Donaldson and the Oakland Athletics have the most wins and best record in baseball heading into the season's second half.

With the All-Star break at an end, it's time to begin the unofficial second half of the 2014 major league season. In one of the tightest playoff races in recent memory, only one team enters play on Friday with a division lead of more than four games, and there are 19 clubs -- 11 in the American League and eight in the National League -- that are within seven games of a playoff spot. How will your favorite team fare in the second half? Tom Verducci previews the rest of the season for every squad, and makes his picks for which clubs will to advance to the postseason.